Which of these statements is correct about the five kingdom given by Whittaker ?

Options

A. Most of the kingdoms have organisms with a poorly defined nucleus .
B. Most of the kingdoms have organisms with a cell wall.
C. Most of the kingdoms have organisms with only one cell .
D. Most of the kingdoms have organisms with RNA as the genetic material

Answer

To solve the question regarding the correct statement about the five kingdoms proposed by Whittaker, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Whittaker's Five Kingdoms**:
- Whittaker classified life into five kingdoms: Monera, Protista, Fungi, Plantae, and Animalia.
- Monera includes prokaryotic organisms (bacteria), while the other four kingdoms consist of eukaryotic organisms.

2. **Analyzing Option A**:
- **Statement**: "Most of the kingdoms have organisms with a poorly defined nucleus."
- **Evaluation**: This statement is incorrect. While Monera (prokaryotes) have a poorly defined nucleus, the other kingdoms (Protista, Fungi, Plantae, Animalia) consist of eukaryotic organisms that have a well-defined nucleus.

3. **Analyzing Option B**:
- **Statement**: "Most of the kingdoms have organisms with a cell wall."
- **Evaluation**: This statement is correct. Most organisms in the kingdoms Fungi (chitin cell wall), Plantae (cellulose cell wall), and Monera (peptidoglycan cell wall in bacteria) have a cell wall. Only Animalia does not have a cell wall.

4. **Analyzing Option C**:
- **Statement**: "Most of the kingdoms have organisms with only one cell."
- **Evaluation**: This statement is incorrect. While Monera and some Protista are unicellular, the kingdoms Fungi, Plantae, and Animalia predominantly consist of multicellular organisms.

5. **Analyzing Option D**:
- **Statement**: "Most of the kingdoms have organisms with RNA as the genetic material."
- **Evaluation**: This statement is incorrect. DNA is the genetic material in the vast majority of organisms across all kingdoms, with RNA viruses being the exception.

6. **Conclusion**:
- The only correct statement is Option B: "Most of the kingdoms have organisms with a cell wall."

### Final Answer:
The correct statement about the five kingdoms given by Whittaker is **Option B**: "Most of the kingdoms have organisms with a cell wall."